Panic attacks (or anxiety attacks - the terms are interchangeable) are intense episodes of fear which are so powerful that they trick you into fearing that you are dying, going crazy, about to faint, or losing control of yourself in some vital way. The symptoms of a panic attack feel so powerful and threatening that they convince you that you're in terrible danger.

Beta Blockers, also known as beta-adrenergic blocking agents, work by blocking the neurotransmitter epinephrine (adrenaline). Blocking adrenaline slows down and reduces the force of heart muscle contraction resulting in decreased blood pressure. Beta blockers also increase the diameter of blood vessels resulting in increased blood flow. Historically, beta blockers have been prescribed to treat the somatic symptoms of anxiety (heart rate and tremors) but they are not very effective at treating the generalized anxiety, panic attacks or phobias. Lopressor and Inderal are some of the brand names with which you might be familiar.
Anxiety disorders reflect disorders that share a general feature of excessive fear (i.e. emotional response to perceived or real threat) and/or anxiety (i.e. anticipation of future threat) and demonstrate behavioral and functional disturbances as a result. Panic attacks are a feature that can occur in the context of many anxiety disorders and reflect a type of fear response.
If you have anxiety that’s severe enough to interfere with your ability to function, medication may help relieve some anxiety symptoms. However, anxiety medications can be habit forming and cause unwanted or even dangerous side effects, so be sure to research your options carefully. Many people use anti-anxiety medication when therapy, exercise, or self-help strategies would work just as well or better—minus the side effects and safety concerns. It’s important to weigh the benefits and risks of anxiety medication so you can make an informed decision.
Those who experience panic attacks are often nervous about having additional episodes. To avoid having a panic attack in a public space, they may avoid places like shopping malls or other crowded spots where previous incidents may have occurred or places that they fear will not allow them immediate access to help, such as an airplane or movie theater. This avoidance when severe may lead to agoraphobia, the inability to leave familiar, safe surroundings because of intense fear and anxiety about having a panic attack outside the home.

Clinical trials are research studies that look at new ways to prevent, detect, or treat diseases and conditions, including anxiety disorders. During clinical trials, treatments might be new drugs or new combinations of drugs, new surgical procedures or devices, new psychotherapies, or new ways to use existing treatments. The goal of clinical trials is to determine if a new test or treatment works and is safe.
Cognitive distortions such as overgeneralizing, catastrophizing, mind reading, emotional reasoning, binocular trick, and mental filter can result in anxiety. For example, an overgeneralized belief that something bad "always" happens may lead someone to have excessive fears of even minimally risky situations and to avoid benign social situations due to anticipatory anxiety of embarrassment. In addition, those who have high anxiety can also create future stressful life events.[90] Together, these findings suggest that anxious thoughts can lead to anticipatory anxiety as well stressful events, which in turn cause more anxiety. Such unhealthy thoughts can be targets for successful treatment with cognitive therapy.
Fear and anxiety can be differentiated in four domains: (1) duration of emotional experience, (2) temporal focus, (3) specificity of the threat, and (4) motivated direction. Fear is short lived, present focused, geared towards a specific threat, and facilitating escape from threat; anxiety, on the other hand, is long-acting, future focused, broadly focused towards a diffuse threat, and promoting excessive caution while approaching a potential threat and interferes with constructive coping.[21]
As is the case the more generalized forms of social anxiety, intergroup anxiety has behavioral, cognitive, and affective effects. For instance, increases in schematic processing and simplified information processing can occur when anxiety is high. Indeed, such is consistent with related work on attentional bias in implicit memory.[39][40][41] Additionally recent research has found that implicit racial evaluations (i.e. automatic prejudiced attitudes) can be amplified during intergroup interaction.[42] Negative experiences have been illustrated in producing not only negative expectations, but also avoidant, or antagonistic, behavior such as hostility.[43] Furthermore, when compared to anxiety levels and cognitive effort (e.g., impression management and self-presentation) in intragroup contexts, levels and depletion of resources may be exacerbated in the intergroup situation.

Exercise regularly. Exercise is a natural stress buster and anxiety reliever. To achieve the maximum benefit, aim for at least 30 minutes of aerobic exercise on most days (broken up into short periods if that’s easier). Rhythmic activities that require moving both your arms and legs are especially effective. Try walking, running, swimming, martial arts, or dancing.
Your brain focuses on some alleged thread, for instance, a very scary thought that was floating somewhere at your subconscious.  Your thalamus – the part of the brain responsible for regulating consciousness, sleep and alertness – transfers that information to your amygdala – the part of the brain responsible for emotional reactions, decision-making and memory – which marks it as “danger” and sends a signal to your sympathetic nervous system, activating the fight-or-flight response.

Panic attacks are common among all anxiety disorders but what sets panic disorder apart is that panic attacks are unexpected and occur "out of the blue" without an obvious trigger (American Psychiatric Association, 2013; Craske & Barlow, 2007). These unexpected panic attacks must be associated with a significant change in behavior or be followed by at least one month of persistent worry about having another attack or about what will happen if you have another panic attack.
Mindfulness involves spending time focusing on the present moment and using a nonjudgmental stance (things are not good or bad, they just are). This may sound straightforward but it can be tricky as our mind often wanders. Try to spend some time each day focusing on a single activity for 10 minutes. For example, focus on the experience of breathing: noticing the physical sensations that you have, the sound of your breath, the feeling of your chest rising and falling as you breathe, the feeling of air entering and leaving your lungs, etc. Try your best to keep your mind focused on these sensations. If you notice your mind wandering, gently redirect it back to the exercise. Engaging in these exercises on a regular basis can help you to feel emotionally centered. Check out websites, apps, and books for more information on mindfulness and guided mindfulness exercises.
Exposure therapy for panic disorder with agoraphobia includes exposure to the situations you fear and avoid is also included in treatment. As in exposure therapy for specific phobias, you face the feared situation until the panic begins to go away. Through this experience, you learn that the situation isn’t harmful and that you have control over your emotions.
Obsessive-compulsive Disorder (OCD): In OCD, a person becomes trapped in a pattern of repetitive thoughts and behaviors that are senseless and distressing but extremely difficult to overcome. Such rituals as counting, prolonged handwashing, and repeatedly checking for danger may occupy much of the person’s time and interfere with other activities. Like panic disorder, OCD can be treated effectively with medication and/or psychotherapy.
While conducting research for this article, we encountered more than a dozen mental health professionals who mistakenly believed the terms “anxiety attack” and “panic attack” were synonymous. They were licensed professionals, but none of them had a specialty in anxiety. Because “anxiety attack” is not a clinical term, they assumed it was a synonym for “panic attack.” This caused them to use the terms interchangeably.
“Panic disorder is diagnosed if the individual has recurrent panic attacks (minimum four in a four-week period), and at least one of the attacks is accompanied by one or more physical symptoms, including persistent concern about having another attack, worry about the implication or consequences of the attack (i.e., having a heart attack), and/or a significant change in behaviour due to the attacks, such as quitting a job.7 In addition, the panic attacks cannot be due to the physiological effects of a substance or another general medical condition.”[1]

The degree of accompanying stress response and its physiological, psychological, and emotional changes are directly proportional to the degree of anxiety. For example, if you are only slightly concerned, such as being slightly nervous about meeting someone new, the body produces a small degree stress response. The small degree stress response can be so slight that you don’t even notice it.